package com.study.webapp.socket.netty.DelimiterBasedFrameDecoder;

import io.netty.bootstrap.Bootstrap;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.Unpooled;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelInitializer;
import io.netty.channel.ChannelOption;
import io.netty.channel.EventLoopGroup;
import io.netty.channel.nio.NioEventLoopGroup;
import io.netty.channel.socket.SocketChannel;
import io.netty.channel.socket.nio.NioSocketChannel;
import io.netty.handler.codec.DelimiterBasedFrameDecoder;
import io.netty.handler.codec.LineBasedFrameDecoder;
import io.netty.handler.codec.string.StringDecoder;

/**
 * 特殊符号判断包：$_
 * DelimiterBasedFrameDecoder自定义字符解码器
 */
public class EchoClient {

    public static void main(String[] args) throws Exception {
        int port = 8080;
        new EchoClient().connect(port,"127.0.0.1");
    }

    public void connect(int port,String host) throws Exception {
        EventLoopGroup group = new NioEventLoopGroup();
        try {
            Bootstrap b = new Bootstrap();
            b.group(group).channel(NioSocketChannel.class)
                    .option(ChannelOption.TCP_NODELAY,true)
                    .handler(new ChannelInitializer<SocketChannel>() {
                        @Override
                        protected void initChannel(SocketChannel ch) throws Exception {
                            //根据$_来判断包，
                            ByteBuf delimiter = Unpooled.copiedBuffer("$_".getBytes());
                            //同时设置包最长字符，超过会抛出一场
                            ch.pipeline().addLast(new DelimiterBasedFrameDecoder(1024,delimiter));
                            ch.pipeline().addLast(new StringDecoder());
                            ch.pipeline().addLast(new EchoClientHandler());
                        }
                    });

            ChannelFuture f =  b.connect(host,port).sync();
            f.channel().closeFuture().sync();
        } finally {
            group.shutdownGracefully();
        }
    }
}
